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OD = Oculus Dexter (Right Eye), OS = Oculus Sinister (Left Eye). These Latin terms are used in prescriptions to differentiate between your eyes.
Sphere measures lens power for nearsightedness or farsightedness. Cylinder and Axis define astigmatism correction and orientation.
The ADD value provides extra magnification for near work (reading, etc.) and is used in bifocals or progressives.
